Effect of moisture absorption on the mechanical performance of natural fiber reinforced woven hybrid bio-composites

ABSTRACT

In the present study, moisture uptake behavior and their effect on mechanical properties of plant fibers were investigated while these fibers were reinforced with epoxy matrix. The developed composites were dipped in tap water for a span of 12 months at room temperature. Hardness (shore-D), tensile, and flexural properties were evaluated after 1 year immersion of samples in water and compared with that of the dry specimens. Water saturated jute/hemp/epoxy composite specimen showed the highest reduction in tensile strength and young’s modulus by 46.9% and 51.8%, respectively. Water saturated hemp/epoxy composite specimen showed the highest reduction in flexural strength by 45.1%. Highest reduction of 39.7% in the flexural modulus was achieved by the jute/hemp/epoxy composite specimen. Hardness had observed no significant decrease in the values due to moisture absorption. scanning electron microscopy images of fractured surfaces of these bio-composites showed quite relevant information regarding weakening of fiber/matrix interface.

摘要

本研究以环氧树脂为基体，研究了纤维的吸湿行为及其对植物纤维力学性能的影响。在室温下将所研制的复合材料浸泡在自来水中12个月。硬度（邵氏D），拉伸和弯曲性能评价一年后浸泡在水中的样品，并与干燥标本相比。水饱和黄麻/大麻/环氧复合材料试件的抗拉强度和杨氏模量分别降低了46.9%和51.8%。水饱和大麻/环氧复合材料试件的抗弯强度最高降低了45.1%。通过黄麻/大麻/环氧复合材料试件获得弯曲模量的最高降低39.7%。硬度没有观察到由于水分吸收值的显著降低。这些生物复合材料的断裂表面的SEM图像显示了关于纤维/基体界面的弱化的相当相关的信息。

KEYWORDS:

• Jute
• hemp
• flax
• epoxy
• mechanical properties
• water absorption

关键词:

• 黄麻
• 大麻
• 亚麻
• 环氧树脂
• 力学性能
• 吸水性。